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Companion galaxy/fuzzy object bound to M33?

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#1 Bill Barlow

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Posted 05 December 2012 - 10:01 PM

I was out last night with my Meade 12 ACF and during the course of the observing session, went to look at M33, the Triangulum galaxy. I noticed that at about the 3 o'clock position on the edge of M33's outer arms, there was a round, somewhat bright object that looked like a small companion galaxy to M33. Or is it something else? I seem to remember seeing this same object with my C14 about 3 weeks earlier. Does anyone know what this is? Thanks.

Bill

#2 blb

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Posted 05 December 2012 - 10:31 PM

I think your seeing NGC 604, a very bright HII region in M33.

#3 Dave Mitsky

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Posted 05 December 2012 - 11:58 PM

I'll second that.

http://astronomy-mal...tar.Clouds.html

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#4 Bill Barlow

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Posted 06 December 2012 - 10:15 AM

Thanks for the information. Pretty neat object to view at higher magnifications.

Bill

#5 Feidb

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Posted 06 December 2012 - 01:22 PM

Yeah, it was NGC-604. There's a lot of M-33 that isn't obvious in the eyepiece. It's a lot larger than first or even second glance. 604 is just the brightest knot in a spiral arm that extends out and may very well be invisible because of the low surface brightness of the galaxy. Sometimes it's tough to see any of it if the conditions aren't right, despite the apparent magnitude.

#6 Achernar

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Posted 06 December 2012 - 07:01 PM

That was NGC-604, the largest and brightest H-II region in M-33, which is 1,000 light years across. It's larger and more massive than any star forming region known in our own galaxy, but the Tarantula nebula in the Large Magellanic Cloud is similar to this object. From a dark site, you will see more H-II regions in M-33 along the spiral arms, making it look like it has the measels.

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#7 GlennLeDrew

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Posted 06 December 2012 - 10:51 PM

It sure seems to be NGC 604, as noted by others.

If there was any doubt, the stated position of "3 o'clock" from M33's nucleus is not unambiguous. How do we know if it's with respect to celestial north, local vertical, or some other orientation? Is the view correct or mirror-reversed? At what distance from the galaxy's center does the object lie? Is there any prominent star or star pattern in the immediate vicinity? These are useful data to supply when asking for help in identifying.

#8 Bill Barlow

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Posted 07 December 2012 - 09:00 PM

I did mention that it was in the 3 o'clock position in the eyepiece near the edge of the galaxies outer arm when viewed through a Meade 12" ACF SCT. I guess I assumed that most would know that this would be a mirror reversed image using the Meade 12. My bad, I guess.

Bill

#9 Bill Weir

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Posted 07 December 2012 - 11:50 PM

Remember though that to the observers perspective at the beginning of the evening the point of an object that is at the 12 o'clock rotates to the 6 o'clock position 6 hrs later.

Bill






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